36 VARIABLE CAMSHAFT TIMING

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Kellie Potter
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36 VARIABLE CAMSHAFT TIMING 11 36 046 REMOVING AND INSTALLING/REPLACING INLET AND EXHAUST ADJUSTMENT UNITS (N52) Special tools required: 11 4 280 11 4 281 11 4 282 11 4 283 Necessary preliminary

1 36 VARIABLE CAMSHAFT TIMING REMOVING AND INSTALLING/REPLACING INLET AND EXHAUST ADJUSTMENT UNITS (N52) Special tools required: Necessary preliminary tasks: Remove Cylinder Head Cover. IMPORTANT: To open central bolts on adjustment units and camshafts. Fit special tool Fit special tool with screws (1). Fit special tool on special tool IMPORTANT: Special tool must be fitted underneath on inlet camshaft. Fig. 222: Identifying Special Tool ( ), ( ), ( ) And Screws Release chain tensioner (2). For tightening torque refer to AZ in CAMSHAFT (N52).

Release central bolt on inlet/exhaust adjustment units (1). For tightening torque refer to 11 36 1AZ in 11 36 VARIABLE CAMSHAFT CONTROL (N52). Fig.

2 Release central bolt on inlet/exhaust adjustment units (1). For tightening torque refer to AZ in VARIABLE CAMSHAFT CONTROL (N52). Fig. 223: Identifying Engine Central Bolt And Chain Tensioner Detach exhaust adjustment unit (1) from exhaust camshaft. Detach inlet adjustment unit (2) from inlet camshaft. Installation: To facilitate removal and installation of adjustment units, turn sensor gears at cutout downwards. Fig. 224: Identifying Engine Inlet And Exhaust Adjustment Unit IMPORTANT: Danger of mixing up adjustment units. Mixing up the adjustment units will result in engine damage.

The inlet and exhaust adjustment units are different. VANOS is marked with AUS and EX for the exhaust camshaft. VANOS is marked with EIN and IN for the inlet camshaft.

3 The inlet and exhaust adjustment units are different. VANOS is marked with AUS and EX for the exhaust camshaft. VANOS is marked with EIN and IN for the inlet camshaft. Sensor gears can be fitted alternatively. Fig. 225: Identifying Inlet And Exhaust Camshaft Mark Fit both adjustment units on camshafts. The installation position of the adjustment units can be freely selected. Insert screws (1). For tightening torque refer to AZ in VARIABLE CAMSHAFT CONTROL (N52). Fig. 226: Identifying Central Screw And Chain Tensioner

IMPORTANT: Incorrect installation possible. Press clamping rail (1) by hand against timing chain and make sure timing chain is guided in clamping rail (1).

4 IMPORTANT: Incorrect installation possible. Press clamping rail (1) by hand against timing chain and make sure timing chain is guided in clamping rail (1). NOTE: Schematic representation on removed chain drive. Fig. 227: Identifying Clamping Rail Adjust Valve Timing. Fit Chain Tensioner. Assemble engine REMOVING AND INSTALLING/REPLACING BOTH SOLENOID VALVES (N52) IMPORTANT: Always check that the solenoid valves are clean during removal and installation. Possible malfunction if valves are contaminated: Rough running. OBD fault entry. Exhaust emission behavior. Low engine power. Necessary preliminary tasks: Remove Acoustic Cover Disconnect plug connection (1) for inlet solenoid valve (2).

Unscrew bolt (3). Remove inlet solenoid valve (2) with bracket towards front. Disconnect plug connection (6) for exhaust solenoid valve (5). Release screw (4).

5 Unscrew bolt (3). Remove inlet solenoid valve (2) with bracket towards front. Disconnect plug connection (6) for exhaust solenoid valve (5). Release screw (4). Remove exhaust solenoid valve (5) with bracket towards front. Fig. 228: Identifying Inlet Solenoid Valve, Plug Connections, Exhaust Solenoid Valve, Screw And Bolt IMPORTANT: Risk of mixing up plug connections (1 and 6) Assemble engine. Check function of DME. 37 VARIABLE VALVE GEAR REMOVING AND INSTALLING/REPLACING ECCENTRIC SHAFT (N52) Special tools required: Necessary preliminary tasks: Remove Cylinder Head Cover. Remove Intermediate Lever. If necessary, move eccentric shaft (1) on twin surface to minimum lift (2).

All bearing caps are identified with numbers; set caps down in special tool 11 4 481 in a tidy and orderly fashion.

6 Fig. 229: Identifying Eccentric Shaft And Lift Release screws on bearing cap number (1). Release screws on all bearing caps (2). All bearing caps are identified with numbers; set caps down in special tool in a tidy and orderly fashion. Remove intermediate shaft with a light tilting and rotating motion. Fig. 230: Identifying Bearing Cap And Number Release screw and remove magnet wheel (1). IMPORTANT: Screw is not magnetic and is secured against falling out.

7 Fig. 231: Identifying Magnet Wheel IMPORTANT: Magnet wheel (1) is extremely magnetic. After removing, protect magnet wheel (1) against metal chips by placing it in a plastic bag (2) with a seal. Fig. 232: Identifying Magnet Wheel And Plastic Bag Carefully press needle bearing (1) apart at split position only to such an extent that it can be removed from eccentric shaft. IMPORTANT: Needle bearing (1) can break very easily.

2007 BMW 525xi. ENGINE Engine - Repair Instructions - N51, N52, N52K 6-Cylinder

2007 BMW 525xi. ENGINE Engine - Repair Instructions - N51, N52, N52K 6-Cylinder Special tools required: 11 4 280 11 4 281 11 4 282 11 4 283 Necessary preliminary tasks: Remove Cylinder Head Cover. IMPORTANT: To open central bolts on adjustment units and camshafts. Fit special tool